Fix typographical error(s)
Fix typographical error(s)

Changed commerical to commercial in README.

lucianmat/js-sequence-diagrams,soswow/js-sequence-diagrams,StefRave/js-sequence-diagrams,StefRave/js-sequence-diagrams,soswow/js-sequence-diagrams,bramp/js-sequence-diagrams,bramp/js-sequence-diagrams,lucianmat/js-sequence-diagrams